Cpphs is a re-implementation of the C pre-processor that is both
more compatible with Haskell, and itself written in Haskell so that
it can be distributed with compilers.
This version of the C pre-processor is pretty-much feature-complete
and compatible with traditional (K&R) pre-processors.  Additional
features include: a plain-text mode; an option to unlit literate
code files; and an option to turn off macro-expansion.
